That kind of money would get a decent horn-based custom speaker from Deja Vu Audio.  This is a dealer that also builds high efficiency speakers utilizing a mix of new and vintage parts.  The better systems utilize horn compression drivers from the 1920’s through the 1960’s and horns from the same period.  Woofers are either vintage or custom new woofers specifically made for Deja Vu Audio.  At this price level, it is worth a trip to the Washington DC area to hear some of these systems.  You will also find that they make terrific tube linestages, amps and DACs too.

Charney Audio Concerto or Companion 

Room that size do not know if that kind of cheese is required to fulfill your goals. 
Assuming room treatments are in use. 
Tobian? 

Charney Companion with the AER driver option is a terrific choice.  Songer makes a fieldcoil driver system that is also very dynamic and big sounding.  The Fyne F1 coaxial driver system also might be a candidate.

about 20 speakers between 40 and 60K

Well if you are not wed to horns then Magico. These require really good electronics... or you are going to hear what is not good about them.

Also, I would look into some of the great ribbon and Electrostatic. These generally require high power amps and very careful placement.

@saummisra Wrote:

Speakers for leading edge, transients, speed and big sound

Klipsch Jubilee see here and here. 

Mike

@ghdprentice Magico A5 would for sure work.
At 180 pounds per speaker better have eaten your Wheaties. 

I do think you sound like you want some horns.  Maybe Klipsch or Altec remakes.

Get 2 pairs of speakers for different flavors,  not get bored with the same speaker and to accommodate a wider variety of.musical genres. Your room seems big enough to fit 2 pairs & the following should fit in your budget..

Speaker#1 JBL K2 S9900

Speaker#2 Tekton Moab

Tektons with the mid array have a very unique sound...its own separate category of speaker.

I am looking to spend about 20-30k on used speakers ( guessing they would have been -40K new a few years back). Any suggestions welcome. I have a 14*20 room and I am looking for dynamics, potentially a great sounding horn or equivalent. Excited by Tektons but since I have the budget wondering if there’s anything better. I did have the JBL M2s that I really enjoyed and Revel Salon 2s that I didn’t so much

Avantgarde, perhaps.

I heard, and liked the Moab.  It is a well balanced system with decent dynamics at modest listening levels (the real test of dynamic capability is how lively the speaker sounds at low levels0.  The JBL K2 is very dynamic sounding and is very good, although not as full and rich sounding as I personally like.  Klipsch speakers are decent, but, modern horn compression drivers and modern horns are not as good as the very best vintage ones, with the exception of some ultra expensive drivers from companies like G.I.P. and Goto (single drivers can blow this budget).  Avantgarde Uno or Duo are quite dynamic, but the bass is not that well integrated with the rest of the sound; still it is a good candidate for a used system.

Uhm the M2 is what you needed? Why have you let go of it? @saummisra 

Anyway if you're open to actives, this - https://aaltospeakers.fi/en/product/taipuu-speakers-3-tie-dsp-aktiivikaiutinpari/

Rockport speakers have outstanding transient response.  There is a pair of Rockport Technologies Cygnus for sale on Audiogon - this is a $65k speaker on sale for $36.5k.

i have the Atria IIs, two levels down from the Cygnus, they are totally transparent and have an ability to retain resolution over an amazing dynamic range.  They will happily play at any level your hearing could stand and at the end of a piano piece you can hear when the dampers touch the strings.

If you Google - Rockport speakers transients - you will get a good description of the sound.

The Cygnus and Atria models use the same mids and tweeters, the Cygnus has beefier woofers.

As you move up the range the cabinets become even more advanced.

@saummisra

Check out the Classic Audio T-1.5. Ralph Karsten of Atmasphere has them. They are beautiful and probably sound spectacular  I would love to hear them. Good luck! 

You could pick up a beautiful Volti Rival in custom veneer of your choice brand spanking new within your budget. All the dynamics, speed, accuracy and room filling sound you can want. Plus you don’t need heroic amplifiers to do so as they are super efficient. Just check out Volti website, a multitude of veneer and grill cloth options. 

Volti Lucera looks interesting.

I wills second Rockport as I own the Avior II's and am beyond thrilled with them.  I will also second Classic Audio as the one time I heard them at RMAF many years ago with Atmasphere electronics it was outstanding.

I second Volti Rivals. I value those loudspeaker traits also & they fill my pretty big room (a little over 6000 cu ft) w/ ease & sound excellent & close to live music. Beyond their speed, dynamics & big sound, they also image  quite well & sound full & rich w/ good amplification. They are not like many pricey speakers that are hyper detailed but sound more like “hifi” than live music. 

@saummisra 

I was going to say Rockports as well as I have tha Avior ii speakers too. They are phenomenal in all regards. I’ll never sell them. But since you seemed to be looking for a horn style I mentioned the classic audio speakers 

@saummisra  - what amplifiers are you using? It's impossible to recommend speakers without knowing what amplification will be used to drive them.

Not what you're asked for, but have a look at SoundLab.

https://www.soundlabspeakers.com/

+1 JBL K2 S9900

If you like the moab you could try the all beryllium version .I have one and also a ulfbricht all beryllium.while they are not as pretty as my focal utopia and kharma grands they are 1 tenth the cost and sound 95 percent as good. Tekton is great to work with and will build you any upgrade including capicators and dsp.tekton has a set of horn speakers as well. For your money you could get both.read the reviews on both those tecktons  the array is fantastic because momentum is mass x velocity and that array is light especially in beryllium or ceramic so it responds super fast  there is a European speaker manufacture copping that array it's so good   enjoy the search call tekton and discuss what you want he will help you.enjoy the search 

Horns are for PA systems.

I have the Rockport Cygnus, but I also have acute FOMO. I read about all the new speakers and I get worked up. Then I listen to my system and it sounds phenomenal when fed via my curated signal path. The Rockport's are not a flashy speaker except that their speaker cabinet design is copied by many. They don't fatigue your brain/ears. At less than 40K used and at 300 pounds they are a tremendous value in my opinion. The real point I want to make is that the Cygnus continues to resolve at greater and greater levels as I improve the signal I feed it. I have not hit it's resolution limit yet, so to me it still has more potential. Last month I added custom made Townshend Podiums and removed the solid footers. They tightened the image and focused the instruments, plus they make the Rockport's look like a modern speaker design. I believe many of these points are valid as you move up and down the Rockport line.

Please don't take this next point as me talking down to anyone, but I want to add  a side point that those of you who try new technologies like the Altaira grounding system, component isolation, power conditioning etc and can't hear their contributions, I suggest that you have exceeded your systems' ability to resolve. You have some weak link that isn't capable of allowing those fine details through. The Parasound JC1+ is an example I have owned that hits a limit on resolution.  The amp does almost nothing wrong tonally and has tons of power and driver grip, but it doesn't allow the resolution of fine acoustic details to be heard. 

Good luck with your search, you have a good budget for a truly great system. After you pick your new speakers make sure the amp compliments the speaker, that your placement is super finetuned, they are isolated from vibrations and have complimentary cables. I used to stretch financially to buy a speaker, hook it up and wonder why it wasn't spectacular. You need to tune it to your room and other equipment. 

0 Audio Icon 12. I thought it was amazing at AXPONA. Also volti is another choice. Lot's of other great choices you will be ignoring though if you are tied to horns.

@saummisra --

Look for a pair of used Meyer Sound X-10’s. They’re active speakers and are about the best that can be had in the 15" woofer/midrange + horn/waveguide class of speakers out there. That’s including the JBL M2, K2 S9900, Everest’s etc., and yes, you’ll have to take my word for it. They don’t sound like horns but deliver a big, effortless, delicate and coherent presentation. Great tonality as well. There’s a "domesticized" tower version in veneer, but I’d seek out the regular duratex finished pro-look version that needs to be lifted up on some low stands. They’re no longer in production and are hard to find, I gather, and they’re industrial looking for sure, but if you’re in this for the sound and what you’re addressing, they’re the real deal and not some overpriced, prettitied home stereo so-so stuff. 

Another interesting option could be the the dutch Stage Accompany speakers, namely the M57 and M59 models. They house a high sensitivity ribbon midrange/tweeter (SA 8535) that plays down to 1.5kHz and up to 20kHz. A friend of mine is using the M57’s (a 2-way MTM design with the SA 8535 and SA 1205 12" woofers) actively configured and subs augmented - a great setup. Personally I’d go for the X-10’s, but the SA speakers are very, very good, and they can be had new within your budget. Like the X-10’s they’re no audiophile beauties but rather made in rugged duratex finish. They’re not about looks, popular audiophile brands, vanity or other but just great sound. EDIT: actually the SA speakers can be had in a range of finishes and colors, other than duratex. 

Then there’s ATC’s SCM300ASL Pro. Outboard actively configured speakers, great sounding to boot, and with a little luck you might be able to find them used within your budget. 

Lastly: Sound Labs ESL speakers, 7ft version on up and with a dedicated sub setup. 

Speakers for leading edge, transients, speed and big sound

My first thought was a line array and/or dipole speaker like the Nola Baby Grand, Genesis Forte, etc., but they are mostly out of your price range even used.  But I found this Pure Audio Project speaker that may well do everything you’re looking for yet starts at under $13k new, and there are a couple available used on USAM.  Just another option to ponder, and best of luck.

https://pureaudioproject.com/quintet15-wall-of-sound-open-baffle-speakers-for-large-rooms/

Rockport 

Fischer & Fischer

Add Vivid Giya G3 or G2 to your audition list.  I recommend looking no further.  True timbre, balanced frequency response, fast, dynamic, excellent leading edge and decay, holographic sound stage.  Get past their eccentric form, the lack of horns, and give them the front end and amplification they deserve and they will provide musical bliss.  Read professional reviews.  Used they will be in your price range.  Contact the importer…GTT Audio in NJ (www.gttaudio.com).  They may have some used on their site.  No vested interest.  Just a great dealer.  

Rockports or Wilson’s.

Fast, great transient response, very coherent, and don’t have the coloration of horn drivers. With your price range you owe it to yourself to take your time, use your ears, not ours. 

Horns are for PA systems.

Ok folks, you heard this genius. Sell your horns.

Have you looked at GR-Research? You could get their NX-Otica, or even the NX-Tremes if you have a high ceiling, and a pair of triple-threat open baffle subs. All that for under $10k. They are kits, so you would have to build them or find someone to put them together for you. They may not look as sexy as some of these high dollar speakers, but properly set up my guess is they would sound phenomenal.

Another voice in cyberspace for Klipsch horns latest model.  Plenty of them to score next to as new.  You can add upgraded drivers and a pair of subs ( a must ) and get ready for takeoff. Well under 20K.

Sonus Faber II Cremonese while not horns are great too. Would never have any remorse if these were in house.

Room treated?

I have heard the Meyer bluehorn. It's a bit of a shame that most audiophiles will never hear some of these pro audio gems...because, I suppose, it didn’t have the gloss finish for the cabinets, in spite of all the engineering that goes into it.

I currently have some tad 'influenced' horns.. Pioneer'sXY series (not that cheap) in my lake cabin...with modest electronics tied to it most times. It easily puts most things I heard at axpona this year to shame...if one doesn’t mind the lack of that glossy cabinet finish, that is..

When Levinson takes a pa speaker, i.e., from that ethos, puts a nice finish on it and sets the price at 200k, it stays backordered with audiophiles running after it.

Look for a pair of used Meyer Sound X-10’s. They’re active speakers and are about the best that can be had in the 15" woofer/midrange + horn/waveguide class of speakers out there. That’s including the JBL M2, K2 S9900, Everest’s etc., and yes, you’ll have to take my word for it. They don’t sound like horns but deliver a big, effortless, delicate and coherent presentation. Great tonality as well. There’s a "domesticized" tower version in veneer, but I’d seek out the regular

Wow! Wish I had that budget! +1 Klipsch Jubilee, Volti Audio, Altec VoT, JBL Everest. Synergy important, especially at that level. Amp, tube, SS, Hybrid? Source, TT, CD, R2R, digital stream? A lot to consider.  Make sure room evaluated by acoustic engineer and set up properly. Then, enjoy the music! 

+1 on Charney Audio Concerto with the AER BD-3 drivers. Super efficient and awesome sound. Get a nice flea watt Set and enjoy audio heaven. 

I have the Companions with the AER and a couple of SVS subs and could not be happier in my 24x32 ft with 14 ft ceilings. Gets plenty loud, even with my 1.5 watt 45 SET.

The Companions go down to 32 Hz. The Concerto goes all the way down to 20 Hz, so probably wouldn't need subwoofers

there's so many really great used speakers in that price range provided you have an additional budget to buy amps that compliment the speakers.

If the $20-30k is your entire budget it would help us to know what you're using for source and how your room sounds, bright, neutral or dull?  

You really shouldn't discount the Tektons. Definitely consider Encore or better yet, Ulfberht's perhaps with Be upgrades. I currently have Moab's with the Be HF drivers only. They are divine. I'm driving them with 60 Watts of Class A Tube power. They're absolutely wonderful. There's also the 1812 Model V12 at $14K.

+1 Volti Rival. What @Doyle3433 said.  It’s a magnificent speaker.  I’ve been running mine with QuickSilver MidMono’s (NOS EL34s) from the beginning. Just stunning!! 

I take delivery of a Tool Shed 300B amp today. I’ll be swapping in the WE tubes from CAD300SEI for a glorious listen session this evening. 

Active or passive ATC.

Dynamic and play loud.

Please be aware, most of these recommendations are for the speakers people own. Go forth and listen for yourself. 

@ozzy62 wrote.

Ok folks, you heard this genius. Sell your horns.

I was about to reply to poster @secretguy on his horn statement, in all earnesty, but yours is better, and not least funnier :)

@deep_333 wrote:

I have heard the Meyer bluehorn. It’s a bit of a shame that most audiophiles will never hear some of these pro audio gems...because, I suppose, it didn’t have the gloss finish for the cabinets, in spite of all the engineering that goes into it.

+1

I can only assume the Bluehorn’s sound fantastic. Going to a cinema that has their EXP range speakers will give an indication, no doubt. 

I currently have some tad ’influenced’ horns.. Pioneer’sXY series (not that cheap) in my lake cabin...with modest electronics tied to it most times. It easily puts most things I heard at axpona this year to shame...if one doesn’t mind the lack of that glossy cabinet finish, that is..

The Pioneer XY-3B speakers are seriously interesting speakers, kudos. I bet they can both bring down the house and be a refined, coherent listen as well?

When Levinson takes a pa speaker, i.e., from that ethos, puts a nice finish on it and sets the price at 200k, it stays backordered with audiophiles running after it.

That’s about the Maggi cube on the mechanisms at play here indeed. 

Thank you all! To those who asked- I have leftover Crown itech 5000 amps left over from my JBL M2s, so I may upgrade them too. The first priority is to get the speakers. In addition to Tektons and other recommendations here, has anyone heard the Joseph Crowe speakers? I heard they are great too. Separately, my room is untreated and likely cannot be treated 

@phusis 

Absolutely, and yes, its a rather unique design...for the horn world, that is ( or i haven’t seen something like it in the past). i would wager that some CFD kinda guy at TAD took over  and a whole lotta sims got run before it came to fruition. I also picked up the horn sub from the series. If i had to get stranded on an island, i’d probably abandon everything else and take this stuff with me.

 Here is their engineering spilling a few technical details....I am in the process of putting a nice finish on the cabinet and painting it a very dark crimson red or a very dark green (can’t decide yet)....make it very very audiophile lookin...

https://www.youtube.com/watch?v=Y8PRw31aSIc

The Pioneer XY-3B speakers are seriously interesting speakers, kudos. I bet they can both bring down the house and be a refined, coherent listen as well?

That’s about the Maggi cube on the mechanisms at play here indeed. 

My first speakers in 1973 were Klipsch LaScalas. While they were amazing for their time I have moved way beyond them. My favorite speakers now are Legacy Focus SEs. Bill Duddleston at Legacy is an incredible speaker designer.  I highly recommend you check out Legacy. They have some amazing stuff. Bill is someone who understands speaker designer. Before you buy check them out. I am an electrical engineer and this guy understands engineering. CHECK THEM OUT!!!!